From what you are saying, if you don't get all As and all A* at a levels your going to be a **** doctor? If you that dreading I wouldn't want you to be my doctor - for all you know those who are getting all these grades could make crap doctors and are only in it for the prestige - I know a guy in my school who had top grades, got into medicine but he is nowhere near caring and has an incredibly short temper, I wouldn't want him to be my doctor - grades don't define your personality!
I dont think it is fair that if you are only doing it because your parents can pay it then yeah, but not a lot of people get into the UK so I admire anyone who is determined enough to have a go somewhere else.